Run Coordination Meetings: Fall 2015 min09 22

September 22, 2015

Present: E. Chudakov, A. Deur, C. Meyer, M. Shepherd, E. Smith.

There will be five weeks of beam operations, out of which there will be at least one week of beam restoration (probably more) starting on Nov. 9th. From discussion with Arne F., it is unlikely that we will get beam before Thanksgiving. In addition, we will have the Hall open during the day for 2 weeks or more for the magnet according to Ben Z. At least one week will overlap with the beam restoration. According to that, we would have at most 4 weeks of possible beam with 12 GeV priority including 1 week or more with beam only during owl and night shifts, if the accelerator agrees (Hall availability to the 12 GeV has priority over the magnet repair).

• Run condition:
  • No magnetic field. Unless accelerators requires it, Hall is open during day (7am-4pm ?) for solenoid repairs.
  • 5mm collimator will be used.
  • The target will remain in gaseous state so that there is no need to man the counting room. Events will come from the solid targets/window on the beam line (1mm CH2 disk on the nose of the ST and 100 μm Al. 2cm downstream of the CH2). If we need a liquid target, we should warn the target group two days in advance (for courtesy. Cooling down the target takes only 5 to 6h). Do we need to install a thicker solid target ?
  • Stand-by shifts from November 30 until December 13. No foreign groups included to limit their travel costs.
  • FDC off (Lubomir P: we should not run the FDC without magnetic field because the high drawn current accelerates the aging of the detector).
  • All other detectors on (required for DAQ and trigger studies). All beamline equipment on except TAC.
  • When accelerator is ready to start its fast feedback commissioning, it needs to be coordinated with solenoid work, which requires the Hall (and thus the tagger) to be open Can all/most of the solenoid work be done in Controlled Access?.

• list of tasks for the Fall 2015 run:
  • 4 hours for 10 days for Fast-Feedback Studies (Accelerator responsibility: Trent Allison, Brian Bevins). There will be no need to man our counting room. Will they do the 5nA tests?
  • Beam line model test. (Expected time unknown, Accelerator responsibility: Todd Satogata). Is this still in the plan?
  • Tagger detectors commissioning (Hall D responsibility: Richard J. and Alex B.). Detailed plan needed from Richard J. and Alex B.
  • Alex S.needs as much data as possible on the PS and tagger detectors, as well as for trigger studies. Alex claims that for his basics investigation, no having the magnetic field doesn't matter. We will need to have the calorimeters, SC and TOF on during theses studies. (Hall D responsibility: Alex S.). Detailed plan needed from Alex S.
  • Sergey F. needs to have dedicated DAQ time (a couple hours/day) since he did not get enough data in May. (Hall D responsibility: Sergey F.). The goal is to optimize DAQ performance : data rate, trigger rate, live time. Several parameters have to be defined for every DAQ components independently: detectors readout (for FDC,CDC,FCAL,BCAL,...) , event builder, data concentrators, event recorder, to find the slowest. Optimization includes different triggers and beam currents.
  • Lubomir P. and Sergei F. would like to test their transition radiation set-up. It should be parasitic to other Hall D activities, but it may require a specific trigger at some point. (Hall D responsibility: Lubomir P., Sergey F.). Need details from Sergey F. .
  • Calorimeters, ST and TOF will take data (for their sake and because of the trigger/DAQ studies).

• List of tasks that cannot be done during the Fall 2015 run:
  • Goniometer and polarimeter commissioning.
  • Total Absorption Counter commissioning.